package com.star.interceptor;

import com.star.constant.JwtClaimsConstant;
import com.star.context.BaseContext;
import com.star.exception.LoginFailedException;
import com.star.properties.JwtProperties;
import com.star.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenBusinessInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getBusinessTokenName());
        if (token == null || token.isEmpty()) {
            response.setContentType("application/json");
            response.setStatus(401); // 令牌为空，返回401状态码
            return false;
        }

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getBusinessSecretKey(), token);
            Long empId = Long.valueOf(claims.get(JwtClaimsConstant.EMP_ID).toString());
            log.info("当前员工id{}：", empId);

            String empToken = "emp_" + empId;
            Boolean sessionValid = redisTemplate.hasKey(empToken);
            if (!sessionValid) {
                throw new LoginFailedException("token已失效");
            }
            // 设置员工id为线程id
            BaseContext.setCurrentId(empId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}
